| Download | - View final version: Investigating the impact of frost heave and thaw softening on changing the vertical force at wheel/rail interface (PDF, 1.2 MiB)
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| Author | Search for: Roghani, A.1; Search for: Liu, Y.1; Search for: Burgess, P.1 |
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| Editor | Search for: Abdulrazagh, Parisa Haji; Search for: Hendry, Michael T.; Search for: Pulisci, Renato Macciotta; Search for: Canadian Rail Research Laboratory |
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| Affiliation | - National Research Council of Canada. Automotive and Surface Transportation
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| Format | Text, Article |
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| Conference | Canadian and Cold Regions Rail Research Conference, CCRC 2021, November 9-10, 2021, Virtual Event |
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| Subject | Canada; cold regions; railway engineering; railways; rail safety; rail systems; rail industry |
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| Abstract | The frost heave results in non-uniform deformation and irregularity on railway track. These irregularities increase the dynamic response of the train-track system, resulting in rapid deterioration of track geometry, and poor ride quality. Large surface roughness may cause unloading of wheels and consequently could lead to derailment. This paper presents the results of employing NUCARS® (New and Untried Car Analytic Regime Simulation) software to evaluate the interaction between rail car and the track as it passes through the frost bumps measured over a railway track section during two freeze-thaw monitoring seasons. The vertical wheel/rail forces (force exerted on the wheel by the rail) at each wheel resulting from the simulation is compared against Association of American Railroads (AAR) standard (Chapter 11 of the AAR Manual of Standards and Recommended Practices Section C - Part II) to determine how passing through the frost susceptible sections may affect the safety of train operations. According to AAR Specification M1001 Chapter XI track worthiness limits, the minimum vertical wheel load should be greater than 10% of the static condition. Using the measured track deformation at a study site located on VIA Rail subdivision in eastern Ontario, the minimum vertical force of 72% of the static load was observed as a result of using the track profile measured during thawing season. This value, which is well above the AAR’s 10% requirement, occurred at the culvert location where there was large non-uniform deformation. Also, by comparing the results of minimum and maximum vertical force for track in various stages of freezing-thawing cycle, it was observed that the thawing stage is creating the worst combination of the forces. |
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| Publication date | 2021-11-09 |
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| Publisher | University of Alberta. Deptment of Civil & Environmental Engineering |
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| Language | English |
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| Peer reviewed | Yes |
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| Export citation | Export as RIS |
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| Report a correction | Report a correction (opens in a new tab) |
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| Record identifier | 031275a2-42c5-4387-bd4c-2debe43f6cc0 |
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| Record created | 2022-09-08 |
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| Record modified | 2022-09-13 |
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